[ 68 4 ] 
CVII. An Account of the extraordinary Agi- 
tation of the Waters in fever al Fonds in 
Hertfordshire : In a Letter from the Rev . 
Thomas Rutherforth, D. D . F. R. S. to 
the Rev. Samuel Squire, D. D. F. R. S. 
Read July i, 
i75 6 - 
I 
Dear Sir, 
Have lately had an opportunity of 
of making fome enquiries about an 
unufual motion of the water in a pond at Patmer- 
hall, which is a farm in the parifh of Albury, and 
county of Hertford. Mr. Thomas Mott, who is the 
occupier of the farm, tells me, that there are two 
ponds in his yard, which are parted from one an- 
other only by a caufey, which is juft wide enough 
to allow of a convenient paffage for a waggon and 
driver: the caufey runs from north to South; fo 
that one of the ponds is to the weft, and the other is 
to the eaft of it. At the weftern end of the former, 
which is the head of it, are two drains, one higher 
than the other, to carry off the wafte water ; and on 
each fide, at the other end, clofe to the caufeway, 
is a mouth, or opening, where his cattle go to drink. 
The pond itfelf is about eight roods over, and twelve 
roods long; The other pond is of the fame fize ; 
except, that there is a dove-houfe in the middle of 
it, which ftands upon a fmall ifland. On the firft 
day of November laft, between ten and eleven 
o’clock in the forenoon, his fervants, who were then 
clofe to thefe ponds, heard a rumbling noife, ftke the 
wind ; 
